I've got headaches trying to decide what plugs to use for my setup. I currently have Autolite 3924s gapped at 0.028" in sad shape. I wanted to step down to a 3923 cuz I'm running 13psi with AFR 205 heads. I kinda want to get away from the autolites, havent been working that great for me. I was looking at NGK Iridiums. I know that Denso and AC Delco also make iridiums. What brand and part # do you recommend? I'd like something that crosses from the autolite 3923.

I have read in several places that the iridiums are not a good idea for boosted applications. I can not remember the reasoning behind this. I have used the autolite iridiums for some time now with no problems. For my heads I have a limited selection of plugs.

okay sounds good and cheap to me. Any opinions on using AC Delco plugs? I just ask cuz I work for a GM dealer and can get them dirt cheap. Plus if I buy them from my work they will come with a 12 month/12,000 mile warranty so if I foul them, replacements are free.

I crossed the #s and found out that the Autolite 3923's are used in the 2006-07 Chevy Cobalt SS. The AC Delco # for the Cobalt SS is 41-106 which is an iridium plug. I think I'm gonna go with those if we have them in stock tomorrow. If not, I'll just get the 3923s.

I run NGK Iridiums. Not sure on the part # though. I have never had any problems with them blowing out or fouling up. I wanted a plug that I knew wouldn't foul out because I have an Incon kit and changing plugs is a PITA.

I run NGK Iridiums. Not sure on the part # though. I have never had any problems with them blowing out or fouling up. I wanted a plug that I knew wouldn't foul out because I have an Incon kit and changing plugs is a PITA.

for pricing, always check out www.rockauto.com . i was able to get plugs reasonably priced. also, www.sparkplugs.com is quit good. and if you have a business you can get set up as a business account (call them) and you get an additional 20&#37; or so off of the listed prices. Make sure you click bottom-right on the 'advanced builders' section... then follow the links...

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